GB2264503A - Replica porous road surface - Google Patents
Replica porous road surface Download PDFInfo
- Publication number
- GB2264503A GB2264503A GB9203619A GB9203619A GB2264503A GB 2264503 A GB2264503 A GB 2264503A GB 9203619 A GB9203619 A GB 9203619A GB 9203619 A GB9203619 A GB 9203619A GB 2264503 A GB2264503 A GB 2264503A
- Authority
- GB
- United Kingdom
- Prior art keywords
- road surface
- replica
- aggregate
- surface according
- replica road
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
- G01M17/022—Tyres the tyre co-operating with rotatable rolls
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0212—Theories, calculations
- G01N2203/0218—Calculations based on experimental data
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
- G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/42—Road-making materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/44—Resins; Plastics; Rubber; Leather
- G01N33/445—Rubber
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Road Paving Structures (AREA)
Abstract
A replica porous road surface for use on a test machine for the study of tyre noise and ride characteristics comprises pieces of aggregate material joined together to form a structure having interconnecting voids wherein the aggregate material has a specific gravity in the range 0.8 to 1.8 and a hardness greater than 80 degrees BS. Preferably the structure contains 15-40% by volume of voids and comprises pieces of aggregate material of substantially one size. In an embodiment of the invention an innermost aggregate layer 23 is embedded in a layer 13 of glass fibre reinforced epoxy resin to anchor to the test drum 12. An outer layer 21 is bonded to intermediate layer 22 and inner layer 23 using an epoxy resin adhesive and is coated with calcined bauxite dust. <IMAGE>
Description
REPLICA POROUS ROAD SURFACES
This invention relates to replica porous road surfaces which are used on test machines in the study of the tyre noise and vehicle ride characteristics.
The use of replica road surfaces on test machines in the laboratory has become well established in the tyre and vehicle industries for the study of the interaction of tyre tread and road surface.
Such replica road surfaces are normally mounted on the outside curved surface of a cylindrical drum which revolves in contact with the tyre and require a special structure which is able to withstand the rigours of tyre testing and the stress due to centrifugal force.
The most common type of road surface, sometimes referred to as the 'wearing course', is a composite material comprising a stone aggregate in a binder which is normally bitumen. Within the structure of the road surface the binder material is almost totally continuous and therefore the composite structure has a very low void content in the order of 2-3%. Normal roads are therefore non-porous and therefore substantially impervious to water.
Accordingly replica road surfaces have needed only to reproduce the top surface of the conventional wearing course. The surface feature of the common aggregate/bitumen road has been successfully modelled using an epoxy resin-based composition.
The process involves first taking an impression of an area of actual road surface using a liquid rubber which when cured is formed in one plane into a curved shape to provide a mould for the casting of "shells" in the epoxy resin. Thus these "shells" have on their outside surface a replica of the road surface texture whilst on the inside surface they may be reinforced by a skin of a glass-resin composite. In a preferred arrangement three such curved shells are bolted to the surface of the test drum to provide a continuous replica surface around the entire periphery of the drum.
Recently, however, new road surface structures have been proposed which have a radically different structure from the old impervious type. These new road surfaces are designed to be porous and the structure has high levels of voids in the range of 15-40% by volume. Such porous surfaces promote drainage of surface water and can lower tyre noise by up to 3 decibels. Plans are now well advanced for the laying of highways having these new surfaces.
It has therefore become necessary to be able to study the interaction of tyres with these new porous road surfaces in the laboratory. However the established materials and method of fabrication are inappropriate to the production of a structure having the required level of voids.
It is therefore an object of the present invention to provide a replica road surface having substantial porosity and sufficient strength and durability for use on a tyre test machine.
According to one aspect of the present invention a replica road surface comprises pieces of aggregate material joined together to form a structure having interconnecting voids wherein the aggregate material has a specific gravity in the range 0.8 to 1.8 and a hardness of greater than 80 degrees BS.
Preferably the structure contains between 15% and 40% by volume of voids. The aggregate material may be a plastics material or a hard rubber and preferably comprises pieces of substantially one size and shape.
Further aspects of the present invention will become apparent from the following description of one embodiment in conjunction with the following
Figures in which:
Figures la-1c show front, side and plan views respectively of a piece of aggregate according to the present invention;
Figure 2 shows the top surface of a section of replica porous road surface according to the invention;
Figure 3 is a schematic diagram showing a cross-section of a replica porous road surface according to the present invention;
Figure 4 shows an end view of a tyre testing drum fitted with the replica road surface; and
Figure 5 shows a front view of the drum of
Figure 4.
Figure 1 shows a piece of aggregate material 1 having seven faces.each bounded by edges of between 8 and 12mm in length. The material of the aggregate is a highly filled cured rubber composition having a specific gravity of 1.6 and a hardness of 86 degrees BS. The aggregate pieces were conveniently manufactured by extruding the uncured rubber to give the cross-section shown in
Figure ib. This extrudate was then cured and cut into short pieces of approximately equal length.
These individual pieces were then coated on their surface with a thin film of LOCTITE 404 (Registered
Trade Mark) adhesive and fabricated in a random orientation to form a structure having 33% by volume of voids. Figures 2 and 3 show respectively a top view and cross-section of this structure which comprises three layers 21-23 having a total thickness of 30-40mm.
The porous structure was fabricated having the outer layer 21 formed against a forming structure of the appropriate curvature for the drum to which the replica surface would be attached. This ensures that the outside surface 11, against which the tyre will be tested, is smooth and correctly curved. The innermost aggregate layer 23 had its inner surfaces embedded in a layer 13 of glass fibre reinforced epoxy resin which formed a rigid anchor layer for attaching to the test drum 12.
The outer surface 11- of the structure was coated with dust of calcined Bauxite to give it a degree of micro-texture. In this instance the dust was applied whilst the adhesive coating was still tacky but it may be applied by any convenient method.
The replica surface was formed in three sections, indicated by 31-33 in Figure 4, which were attached to the test drum 34 by bolts 36 passing through reinforced edge portions 35 as shown in Figure 5.
Alternative aggregate materials which may be used in the practice of the invention include plastics materials such as nylon or polypropylene.
Any adhesive may be used which is suitable for bonding to the aggregate material. Suitable adhesives for aggregates based on rubbers and plastic include acrylic, epoxy or isocyanate based products.
Claims (16)
1. A replica road surface comprising pieces of aggregate material joined together to form a structure having interconnecting voids wherein the aggregate material has a specific gravity in the range 0.8 to 1.8 and a hardness of greater than 80 degrees ES.
2. A replica road surface according to claim 1 wherein the structure contains 15-40% by volume of voids.
3. A replica road surface according to either claim 1 or claim 2 wherein the aggregate material comprises pieces of substantially one size.
4. A replica road surface according to any of claims 1-3 wherein the aggregate material comprises pieces of substantially the same shape.
5. A replica road surface according to any of claims 1-4 wherein the aggregate material is a hard rubber.
6. A replica road surface according to any of claims 1-5 wherein the aggregate material is a plastics material.
7. A replica road surface according to any of claims 1-6 wherein the aggregate pieces are polyhedroid in shape.
8. A replica road surface according to claim 7 wherein the aggregate pieces have seven faces.
9. A replica road surface according to either claim 7 or 8 wherein the boundary between two adjacent faces of the aggregate material is between 6-12mm in length.
10. A replica road surface according to any of claims 7-9 wherein the boundary between two adjacent faces of the aggregate material is 8mm in length.
11. A replica road surface according to any of claims 1-10 wherein the structure is multi-layered.
12. A replica road surface according to any of claims 1-11 wherein the structure comprises three layers.
13. A replica road surface according to any of claims 1-12 wherein the surface which contacts the tyre is coated with an aggregate dust to provide a degree of micro-texture.
14. A replica road surface according to claim 13 wherein the aggregate dust is calcined BAUXITE dust.
15. A replica road surface according to any of claims 1-14 wherein the aggregate pieces have substantially plane faces.
16. A replica road surface substantially as described herein and shown in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9203619A GB2264503A (en) | 1992-02-20 | 1992-02-20 | Replica porous road surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9203619A GB2264503A (en) | 1992-02-20 | 1992-02-20 | Replica porous road surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9203619D0 GB9203619D0 (en) | 1992-04-08 |
| GB2264503A true GB2264503A (en) | 1993-09-01 |
Family
ID=10710750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9203619A Withdrawn GB2264503A (en) | 1992-02-20 | 1992-02-20 | Replica porous road surface |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2264503A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2332206A (en) * | 1997-12-12 | 1999-06-16 | Airbath International | Filler |
| WO2005116638A1 (en) * | 2004-05-27 | 2005-12-08 | Better Loggers Pty Ltd | Apparatus for testing a tyre and/or road surface |
| CN102279254A (en) * | 2011-05-09 | 2011-12-14 | 华南理工大学 | Research method for formulation of disease-free epoxy asphalt mixture for large-span steel bridge deck |
| WO2012103197A2 (en) | 2011-01-26 | 2012-08-02 | Bridgestone Americas Tire Operations, Llc | Engineered surfaces for laboratory tread wear testing of tires |
| EP2784469A1 (en) * | 2013-03-25 | 2014-10-01 | MAHA-AIP GmbH & Co. KG | Test bench roller with a roadway covering element |
| US9421748B2 (en) | 2011-12-29 | 2016-08-23 | Compagnie Generale Des Etablissements Michelin | Tire operating surface for tire testing road wheel |
| US9581525B2 (en) | 2012-09-30 | 2017-02-28 | Compagnie Generale Des Etablissements Michelin | Method of applying particulate material along a tire footprint during tire testing on a tire testing surface |
| US9702789B2 (en) | 2012-10-31 | 2017-07-11 | Compagnie Generale Des Etablissements Michelin | Method and apparatus for distributing particulate material along a tire footprint during tire test |
| JP2017138158A (en) * | 2016-02-02 | 2017-08-10 | 住友ゴム工業株式会社 | Manufacturing method of travel drum, and travel drum |
| CN111579377A (en) * | 2020-06-05 | 2020-08-25 | 大连理工大学 | Dynamic and static triaxial test device capable of eliminating influence of membrane embedding effect |
-
1992
- 1992-02-20 GB GB9203619A patent/GB2264503A/en not_active Withdrawn
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2332206B (en) * | 1997-12-12 | 2001-09-19 | Airbath Internat | A shower tray moulding incorporating a filler |
| GB2332206A (en) * | 1997-12-12 | 1999-06-16 | Airbath International | Filler |
| WO2005116638A1 (en) * | 2004-05-27 | 2005-12-08 | Better Loggers Pty Ltd | Apparatus for testing a tyre and/or road surface |
| EP2668486A4 (en) * | 2011-01-26 | 2018-01-31 | Bridgestone Americas Tire Operations, LLC | Engineered surfaces for laboratory tread wear testing of tires |
| WO2012103197A2 (en) | 2011-01-26 | 2012-08-02 | Bridgestone Americas Tire Operations, Llc | Engineered surfaces for laboratory tread wear testing of tires |
| EP3540404A1 (en) * | 2011-01-26 | 2019-09-18 | Bridgestone Americas Tire Operations, LLC | Engineered surfaces for laboratory tread wear testing of tires |
| CN102279254A (en) * | 2011-05-09 | 2011-12-14 | 华南理工大学 | Research method for formulation of disease-free epoxy asphalt mixture for large-span steel bridge deck |
| CN102279254B (en) * | 2011-05-09 | 2013-03-20 | 华南理工大学 | Research method for formulation of disease-free epoxy asphalt mixture for large-span steel bridge deck |
| US9421748B2 (en) | 2011-12-29 | 2016-08-23 | Compagnie Generale Des Etablissements Michelin | Tire operating surface for tire testing road wheel |
| US9581525B2 (en) | 2012-09-30 | 2017-02-28 | Compagnie Generale Des Etablissements Michelin | Method of applying particulate material along a tire footprint during tire testing on a tire testing surface |
| US9702789B2 (en) | 2012-10-31 | 2017-07-11 | Compagnie Generale Des Etablissements Michelin | Method and apparatus for distributing particulate material along a tire footprint during tire test |
| EP2784469A1 (en) * | 2013-03-25 | 2014-10-01 | MAHA-AIP GmbH & Co. KG | Test bench roller with a roadway covering element |
| JP2017138158A (en) * | 2016-02-02 | 2017-08-10 | 住友ゴム工業株式会社 | Manufacturing method of travel drum, and travel drum |
| CN111579377A (en) * | 2020-06-05 | 2020-08-25 | 大连理工大学 | Dynamic and static triaxial test device capable of eliminating influence of membrane embedding effect |
| CN111579377B (en) * | 2020-06-05 | 2021-05-07 | 大连理工大学 | A dynamic and static triaxial test device that can eliminate the influence of membrane embedding effect |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9203619D0 (en) | 1992-04-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |